Nipple brush



FIG. 1 is a perspective view showing my new design in conjunction with probable environmental structure, which is shown in broken lines for illustrative purposes only and forms no part of the claimed design.

FIG. 2 is a second perspective view;

FIG. 3 is a front elevational view;

FIG. 4 is a side elevational view;

FIG. 5 is a top plan view bottom; and,

FIG. 6 is a bottom plan view. 

The ornamental design for a nipple brush, as shown and described. 